Question

Sam's grandfather gave him some money as a birthday present. Sam says he will put his money in a safe place and add part of his allowance each week. He says that after 5 weeks he will have a total of $175 and after 8 weeks he will have $190. How much money is Sam planning to save each week? How much money did his grandfather give him for his birthday

Answer 1

($190-$175)/(8weeks - 5weeks) = $15/3weeks = $5 every week

$5 x 5weeks = $25 
$175-$25 = $150 starting